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• How to use timeline editing with a single image input in ffmpeg ?

  29 septembre 2017, par Serge

  Small image should be animated over a background video in a simple way :

  1. change position - move along a straight line, no easing. Starting at frame A, till frame B (i.e. frames 11 to 31) ;
  2. zoom in - between frames C and D (i.e. 45 and 55).

  Filters I intend to use :

  • overlay filter has x and y parameters for image position ;
  • zoompan filter allows zooming (preceeded with a static scale up to avoid jitter).

  My filtergraph :

  video.avi >----------------------------------->|-------|
  
                                                 |overlay|-> out.mp4
  
  image.png >-> scale >-> zoompan >-> zoompan >->|-------|

  ---

  The problem is with timeline editing. Both filter support the enable option. I thought I could add instructions like enable='between(n, 11, 31)' to "place" the animations at right times.

  Appears that the image input has only two values of n : zero and 1. Checked that by wrapping n with print(n) in zoompan filter to output during rendering.

  Inside overlay filter, in opposite, n outputs sequence of numbers as expected.

  ---

  Question : how can I make the single image input "look" like a normal video stream to ffmpeg filters – so that every generated frame has its unique number ?

  ---

  One of the latest tests. Video is hd720, image is 1000x200 transparent png with the logo occupying about 150x50 area in the center, not to be cropped out when zoomed in.

  ffmpeg -i $FOOTAGE -loop 1 -i $IMAGE -filter_complex \
  
  "
  
  [1:v]
  
    scale=10*iw:-2
  
    ,zoompan=
  
      z='1'
  
      :x='iw/2-(iw/zoom/2)+80'
  
      :y='ih/2-(ih/zoom/2)'
  
      :d=26
  
      :s=500x100
  
      :enable='lt(print(n),24)'
  
    ,zoompan=
  
      z='min(zoom+1.3/18,2.3)'
  
      :x='iw/2-(iw/zoom/2)'
  
      :y='ih/2-(ih/zoom/2)'
  
      :d=20
  
      :s=500x100
  
      :enable='between(n,24,42)'
  
  [name];
  
  [0:v][name]
  
    overlay=
  
      x=1005-250
  
      :y=406-50
  
      :enable='lte(n,173)'
  
  " -t 7 -y  -hide_banner  out.mp4

• How to process single segment from fragmented mp4 container ?

  14 septembre 2020, par user14258924

  I have fragmented mp4 that I stream. First the mp4 header and then individual segments that are each one GOP. It is h264 and aac encoded video that I am getting from RTMP server.

  


  I would like to process these individual segments with ffmpeg(I doubt there are other tools available). Either adjust resolution or bitrate or even transcode to vp8/9 or avi1 if needed.

  


  But it seems that ffmpeg cannot handle this because the segment has no header. So I wodner if there is a flag or set of flags for ffmpeg to be able to process these segments without the header ? I could possibly just take the raw h264 and aac packets from the RTMP and not pack it into MP4 container beforehand, if that helps - would ffmpeg be able to process these ?

  


• Scale and overlay in single command

  10 juin 2020, par Hasan Yilmaz

  I want to convert and resize a video and put a logo on it. I am doing this with 2 different command line like this.

  



  Command 1 :

  



  D:\Logo\ffmpeg -i "D:\Logo\video.mxf" -vf scale=1280:720 "D:\Logo\video.mxf_fullHDtoHD.mp4"


  



  Command 2 :

  



  D:\Logo\ffmpeg -i "D:\Logo\video.mxf_fullHDtoHD.mp4" -i D:\Logo\logo_720p.png -filter_complex "[0:v][1:v] overlay=60:50"  "D:\Logo\output_720p_with_logo.mp4"


  



  Can I do this in just one command ?